Sewing machine



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G. SAUER SEWING MACHINE Filed April 2, 1940 Sept. 14, 1943.

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Patented Sept. 14, 1943 p 2,329,431 SEWING MACHINE George Sauer, Berwyn, Ill.-, assignor to Union v Special MachineCompany, Chicago, 111., a corporation of Illinois Application April 2, 1940, Serial Nl 32'7,394

j sclaiinaj (01. 112256) g v r having a hollow base J0 whereof the top 'H con- This invention relates to sewing machines, and

has reference more especially to automatic lub-ricating systems for such machines; l v

I Sewing machine lubricating systems have heretofore been constructed with separately at; tached reservoirs; and with-tubing for conveying the oil from the reservoirs to various individual movingelementswhich require constant oiling for efficient performance at high'speeds. Oiling systems ofthis type are costly, not only by reason of the great number of parts involved, but also from thestandpoint ofassembling them, and, were moreover liable toleakage at joints. The chief aim of my invention, is to obviate the above mentioned and'other' drawbacks. This objective I realize, as hereinafter more fully disclosed, by constructing the oil reservoirs integrally with the machine frames at "regions where they will not interfere with the passage of the work or with the manipulation of it by the machine operators, and'by forming in the frames,

channels or passages-whereby the oil is conducted to the parts requiring lubrication.

In connection with lockstitch. sewing I machines, it is a further aim-of my invention to provide for the automatic lubrication of the rotary hooks with oil different than that employed for stitutes the work support. Rising from the base' at the'right hand end is a standard l2 from the top of which extends horizontally an overhanging arm I3 terminating in a head M at its free end. and suitably guided for up and down movement in said head is a bar 'l5 with a needle 18 at its lower end. Within the head It, the bar I5" is connected, by means of a pitman i7, with acrank 18 .at the left hand end of. ahor'izontal shaft 19 which issuitably journalled within the" through the left hand end wall of the machine base and is journalled in bearing sleeve 26. As shown, the bearingslee've '26 i supported adjacent one'endin the-wall 25'andadjacent its other end in a lug projection 21 pendent from'the work support ll. Spaced from the projection 21 is the other parts of the machines, from auxiliary reservoirs likewise integrally constructed with the machine frames and byway of passages formed in said frames. I Y 5 p r Other objects and attendant advantages will appear from the following detailed description of the attached-drawings,wherein Fig.1 is a ;view partly in side elevation and partlyjin longitudinal section, of a sewing machine conveniently embodying my invention, the

section being taken as indicated by the angled arrows I-'-I in Fig. 2. I v

Fig. 2"is a view of the machine in top: plan with certain portions of the machine frame The machme herei d 'i tj a is or h m another pendantlug 28 which supports a bear-- ing 29 wherein the inner end of'the rotary hook shaft 23 is journalled. Through a train of intermeshing spur gears 30 and 3|, the rotary hook shaft 23 is driven from a shaft 32 which extends lengthwise of and is suitably journalled within the hollow of the base 10. lhe shaft 32 is in turn driven, through a train of intermeshing spur gears 33, 34 and 35 within the standard l2, from the upper shaft l9 previously referred to. The base [0 is closedatthe bot-tom'by a'removable plate 36 and is kept filled with lubricating oil to the level indicated at L in Figs." 1 and 3 with thegear pinion33 onthe shaft 32 dipping into the oil. Thus, by rotation of the gears 3-3 35, oil is carried up within the-hollow of the standard .|2- and dispersed therein; someof such dispersed oil finding itsway-into the bearings- 31 and 38 for the shaft'39 of the intermediate gear 34, and some of it finding its way into a catch receptacle 43 formed within the standard I2 substantially at the level of the work support I I. The work support H is recessed as atA l, and the recessed portion has a lengthwise extending channel 42 which communicates by way of a duct 43 with the catchreceptacle as shown in Fig.1, and which has a laterally widened terminal end portion or branch 44. (Fig. 2) with openings at the bottom wherefrom a plurality ofwick's 45 lead to various Insofar as described up to this point, the ma-" chine is generally like that forming the subject matter of a copending application, Serial No.- 311,722, filed by Norman V. Christensen, George Sauer and Oscar Quist on December 30, 1939, to which reference may be had if deemed necessary.

For the purpose of lubricating the rotary hook 22 with different or lighter oil than that used in the base it, provisions have been made in accordance with my invention as follows:

Integrally formed with the work support II at the rear of the standard [2, see Figs. 2 and 3, is a vertically-shallow horizontally-elongate external projection 50 with an axial bore which is closed at opposite ends by removable screw caps 52 and 53 so that it may serve as an auxiliary reservoir for oil. The screw caps 52 and 53 are preferably made of transparent material so that the level of the oil may be observed at all times from the exteriorr By reason of its location behind the standard 12; the auxiliary reservoir 5| cannot interfere with the advance of the material being sewed across the work support, and is not in the way of the hands of the operator in manipulating the material. Extending first downwardly from the auxiliary reservoir 5| and r then horizontally through the work support I I is a duct 55 by which the oil is conducted to another channelf56 in the recessed portion 4| of the work support, the last mentioned channel having an inwardly-reaching lateral branch 5'! with a terminal port 58 that leads down into the interior of the inner bearing for the rotary hookshaft 23, see Fig. 1. From Fig. 1, it will also be noted that the bearing 29 is closed at one end by a screw plug 50 and that the rotary hook shaft 23 is tubular, i. e., has a lengthwise extending duct 5! which is open at its rear end to themterior of the bearing 29. Consequently, oil will flow by gravity from the auxiliary reservoir 5| by way of the passages 55, 56, 5'! and 58, into the duct 6| of the rotary hook shaft. 23 and conveyed by the latter to the parts of the rotary hook 22 which require lubrication. Flow of such oil to the rotary hook is controllable by a screw valve 62 whereof the inner end enters the duct 6| within said shaft and forms a-regulatable obstruction across it. The breather holes shown at 63 in Figs. 2 and 4 prevent the reservoir 5| from becoming air bound.

The oil supply in the auxiliary reservoir can be replenished from time to time thr'ougha filling opening 64 in its top, see Figs. 2 and-5, said opening being threaded to receive a screw plug 65 with a manipulating knob 66 at its upper end. The lower end 67 of the screw plug 65 is reduced in diameter and smooth so that it may enter the vertical branch 55a of the passage 55 when the plug is screwed home as shown inFig. 5, and thereby stop the flow of the oil from the auxto time of a filter screen 69 which, when in position, extends crosswise of the vertical portion 55a of the passage 55 and which is packed with a suitable fibrous filtering material, as conventionally indicated in Fig. 6 to intercept any particles of foreign matter carried along in the oil.

Having thus described my inventio rnI claim:

1. In a sewing machine, a frame providing a work support; a needle movable up and down through the work support; complemental stitch forming means to cooperate'with the needle below the work support; an integral projection on iliary reservoir in the event that it shouldior the work support having a horizontal bore extending through it and accessible for cleaning from the exterior; removable caps closing the ends of the bore to form a reservoir for lubricating oil; and a gravity ilow duct below the surface of the work support by way of which oil is conducted from the reservoir to the complemental stitch forming means.

2. A sewing machine-according to claim 1, in which the caps closing the ends of the bore of the projection are of transparent material to enable observation of'the oil content of the reservoir from the exterior.

3. In a sewing machine, a frame providing a work support with an overhanging needle arm sustained by a standard at one end of said support; a bar guided for reciprocation in the needle arm and carrying a needle for movement up and down through the; work support; complemental stitch forming means to'cooperate with the needle below the work support; an integral projection on the worksupport located out of the way at the rear of the standard, said projection having a horizontal cylindric bore extending through it and accessible for cleaning frornthe exterior; removable caps closing the ends of the bore to ,5 form a reservoir for lubricating oil; and agravity flow duct below the surface of the work support by which oil is conducted from the reservoir to the complemental stitch forming means.

4. In a sewing machine, a frame providing a work support; a needlemovable up and down through the work support; complemental stitch forming means to cooperate with the needle below the work support; an integral projection on the work support having ahorizontal bore extending through it andaccessible for cleaning from the exterior; removable caps closingthe ends of the bore to form-a reservoir for lubricating oil; a.'horiz onta:1 gravityfiow duct below the surface of the work support for conducting oil to the complemental stitch-forming means; a bore extending from the bottom of the reservoir through the work supportto the horizontal duct;

a filling opening in the, top of the reservoir in line with said vertical bore and permitting access to the latter for cleaning; and a removable-plug closing said filling opening.

, 5. In a sewing machine, a frame providing a work support; a needle movable up and down through the work support; complemental stitch forming means to cooperate'with the needle below the work support; an integral projection on the work support with a horizontal bore extending" through it'and accessible for cleaning from the exterior; removable caps closing the oppositeends of the bore to form a reservoir forlubrica'ting oil; a horizontal bore in the thickness of the work support constituting a duct whichleads from the reservoir to the complemental stitch I forming means; and a removableqplug closing one end of the horizontal bore'in'the work supvport and permitting access to said bore for cleaning. v ,7 l 1 p 6. In a sewing machine, a' frame with a hollow base which contains a supply of lubricating oil and of which the top serves asia work support,

and a communicating hollow' standard rising from the base and sustaining a horizontal overhanging arm; a needle guided for up and down movement at the free endof the arm; means taking oil from the supply in the base and dispersing it withinthe standard; a catch receptacle within the standard for trapping some of the dis,- persed oil; a rotary, hook to cooperate with the needle below the work support; a bearing for the shaft of the rotary hook; a gravity duct for conducting oil from the catch receptacle to the surface of the hook shaft within the bearing; an

external auxiliary reservoir for lubricating oil integrally formed with the frame above the work support, said reservoir having a smooth cylindric bore with an'open end closed by a removable plug; and a gravity duct independent of the first mentioned duct leading from the auxiliary reservoir to conduct oil to the rotary hook.

'7. In a sewing machine, a frame with a hollow base which contains a supplyof lubricating oil and of which the top serves as a work suppOrt, 7

standard; another flow passage independent of thefirst mentioned'passage, leading from the r auxiliary reservoir through the work support; and means for conducting, oil from the last mentioned flow passageinto the opposite end'of the rotary hook shaft for lubrication of the rotary hook." 1

I 8. In a sewing machine, a frame with a hollow base which contains a supply of lubricating oil and of which the top servesas a work support,

and a communicating hollow standard which rises from the base and sustains a horizontal overhanging arm; a needle at the lower end of a bar guided for up and down movement in the free end of the overhanging arm; means taking oil from the supply in the base and dispersing it within the standard; a catch receptaclewithin and a communicating hollow-standard risin J from the base and sustaining a horizontal overhanging arm above the base; a needle at the lower end of a bar guided for up and down movement in the free end of the arm; means taking oil from the supply in the base and dispersing it within the standard; a catch receptacle within the standard substantially at the level of the work support for trapping some of the dispersed oil;

complemental stitch formingmeans to cooperate I with the needle below the work support including a rotary hook, and a hollow shaft to'one end of which the hook is secured; a bearing on the work support for the hook shaft; a passage in the work support for conducting oil from the 7 the standard substantially at the level of thev work support for trapping some of the dispersed oil; "complemental stitch forming means to cooperate with the needle below the work support comprising a rotary hook, and a hollow shaft to one end of which the hook is secured; a main v bearing on the machine frame for thehook shaft; v

a passage in the work support for conducting oil from the catchjreceptacle to the surface of the hook shaft within the bearing; an external auxiliary reservoir for lubricating oil integrally formed on the machine frame above the work ,support at the rear of the standard; another flow passage independent of the first mentioned passage leading from the auxiliary reservoir through the work support; a supplemental bearing on the machine frame into which the opposite open end of the hook shaft extends; andia port extending down; into the supplemental bearing from the last mentioned flow passage;

- GEORGE SAUER. 

